
Personally I would just remake a character. Hells, use same background story to a degree, but tweak it to fit another race, give the char in question a lore appropriate name, because hey, midlanders don't quite run around with elezen names!
However, glamours as shown in the AST questline is an option as well, given the person gone from looking like a Duskwigh, to looking like a Midlander, with ease on top of that as well. It is totally possible, but lots of people would refuse to roleplay with that as well, and it still doesn't change your character to really be a Midlander.
I'd really go for a 2.0 version of your 'old' character. Tweak background, give her another name ect.
However, glamours as shown in the AST questline is an option as well, given the person gone from looking like a Duskwigh, to looking like a Midlander, with ease on top of that as well. It is totally possible, but lots of people would refuse to roleplay with that as well, and it still doesn't change your character to really be a Midlander.
I'd really go for a 2.0 version of your 'old' character. Tweak background, give her another name ect.